#ifndef REQUIRE_H
#define REQUIRE_H
#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <string>
using namespace std;
inline void require(bool requirement,
                    const string &msg = "Requirement failed")
{
    using namespace std;
    if (!requirement)
    {
        fputs(msg.c_str(), stderr);
        fputs("\n", stderr);
        exit(1);
    }
}

inline void requireArgs(int argc, int args,
                        const string &msg =
                            "Must use %d arguments")
{
    using namespace std;
    if (argc != args + 1)
    {
        fprintf(stderr, msg.c_str(), args);
        fputs("\n", stderr);
        exit(1);
    }
}

inline void requireMinArgs(int argc, int minArgs,
                           const string &msg =
                               "Must use at least %d arguments")
{
    using namespace std;
    if (argc < minArgs + 1)
    {
        fprintf(stderr, msg.c_str(), minArgs);
        fputs("\n", stderr);
        exit(1);
    }
}

inline void assure(std::ifstream &in,
                   const string &filename = "")
{
    using namespace std;
    if (!in)
    {
        fprintf(stderr, "Could not open file %s\n",
                filename.c_str());
        exit(1);
    }
}

inline void assure(std::ofstream &out,
                   const string &filename = "")
{
    using namespace std;
    if (!out)
    {
        fprintf(stderr, "Could not open file %s\n",
                filename.c_str());
        exit(1);
    }
}
#endif